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January 2004
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2004.01.23 15:57 "Re: How to convert MINISBLACK to PHOTOMETRIC_RGB", by Bob Friesenhahn
On Fri, 23 Jan 2004, Frank Warmerdam wrote: > Bob Friesenhahn wrote: > > How does this treat the two extra samples? Does it ignore them? > > I believe that GDAL treats the 3 samples as red, green and blue in the > command shown by Andrey. And GraphicsMagick will only extract the primary gray channel. > PS. I don't think the Imagine generated TIFF file is so odd. In the > satellite imaging community it is common for us to use MINISBLACK for > multispectral tiff files. The only odd part, in my mind, is the use of > the unspecified ExtraSamples tag. When I see multi-sample MINISBLACK > TIFF files I assume that each sample should be treated as MINISBLACK with > no obvious pre-set RGB sample combinations. Right. MINISBLACK is pretty ordinary. The intent/meaning of the extra samples is undefined and may be proprietary. Perhaps they could be some sort of mask, or overlays which can be enabled/disabled in viewing software. Bob ====================================== Bob Friesenhahn bfriesen@simple.dallas.tx.us http://www.simplesystems.org/users/bfriesen